/Engine/Plugins/FX/Niagara/Source/Niagara/Public/MovieScene/MovieSceneNiagaraSystemTrack.h
Sub-classes can override this method to perforum custom evaluation tree population logic.
virtual bool PopulateEvaluationTree ( [TMovieSceneEvaluationTree](API\Runtime\MovieScene\TMovieSceneEvaluationTree)< [FMovieSceneTrackEvaluationData](API\Runtime\MovieScene\FMovieSceneTrackEvaluationData) > & OutData ) const